"These last two divisions reflect the seeming dichotomy of Christian character: sternness with ourselves and tenderness towards others. Only the Holy Spirit can create such a beautiful dichotomy of sternness and tenderness within a single human personality."
Jerry Bridges, The Practice of Godliness. I’ve only read the preface and I already like this guy!
(That dichotomy/paradox is one, I think, of which Chesterton would be proud)